1.Don't be rude
2.Be positive
3.Offer to help
4.Be reliable and trustworthy
5.Say Please and Thank You
6.Try to be a leader in your team, give advices and which operators are needed to take into one or another situation.
7.If there are toxic people in our team do not mess with them,you can always leave and find a new match.If this is ranked match just mute them,aggression will not lead to anything.

Communication
Staying in constant communication with your team is what keeps everyone together in high-pressure situations and prevents players from making critical mistakes. Regardless of your rank, it’s imperative to verbally communicate via your microphone. Make sure that your mic button is easily accessible and easy to press without putting you at a disadvantage while using it.

By communicating with your teammates, it will give them the information that they need throughout the round to make good choices for your team. Likewise, you should make smart and accurate calls of everything that you see that can be of use in order to gain a tactical advantage over your opponents.

Part of communicating is knowing what is and isn’t appropriate to say during high-pressure rounds. If you find yourself getting frustrated while playing, do not complain and make excuses to your teammates. Just make the call immediately after you die and then if you feel the need to complain, do so off the mic.
Utilizing your teammates
Being a good team player means to know how to utilize your teammates in order to gain an advantage over your enemies. This is where your communication skills come into play by working with your team to ensure you win the round.

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P.S guide made for the fan